But the CAGRO didn't know he was going to EVD. No one did. Except the pilot of the Jab, and he didn't tell anybody. And there's the problem. Break one link in a system that needs all the links to work, and it doesn't. Take away every other bandaid added to try and make see and avoid work, and you find see and avoid doesn't work. Even alerted see and avoid often doesn't work. The A320 crew were basically told by TCAS what direction to look and still couldn't see anything.
It's OCTA. The separation standard is that there isn't one. Missing is enough. If you want to apply standards and minimums, it can't be uncontrolled. In ye olde days, when there were only two types of airspace, the rules dictated who could fly in what or who must fly in what, and how you did it. Now there is an alphabet of airspace, where sometimes you're sort of controlled, and sometimes you're sort of uncontrolled, or sometimes you are and the other guy isn't, or sometimes someone's looking out for you, but sometimes they're not because they're busy doing something else. And jets full of mug punters are mixing it up with Jabs and powered hang gliders.
The solution? We need what the yanks have. It seems to work. BUT, we need the infrastructure the yanks have to support it, which we don't have, because it costs a fortune. Someone thought it would be a good idea to have what the yanks have, without the corresponding infrastructure, thinking it would come for free. It doesn't, and that's why we have the mess.